Casing or pipe wrench.



J. G. LAPFERTY.

CASING 0B PIPE WRENCH.

APPLICATION mum JULY 24, 1908.

91 9 ,599, Patented Apr. 27, 1909.

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JAMES C. LAFFERTY, OI LOWMAN, WEST VIRGINIA.

CASING OR PIPE WRENCH.

Specification of Letters Patent.

Patented April 27, 1909.

Application filed July 24, 1908. Serial No. 445,238.

To all whom it may concern:

Be it known that 1, JAMES C. LAFFERTY, a citizen of the United States,residing at Lowman, in the county of Wetzel and State of West Virginia,have invented a new and use ful Improvement in Casing or Pipe Wrenches,of which the following is a specification.

This invention relates to a wrench for gripping pipes employed in deepwells, the ob ject of the invention being a wrench of this kind whichcan be employed for screwing and unscrewing well casings and designed toreplace the usual rope method.

Figure 1 is a plan view of my wrench in position, partly broken away andshown in section, and a casing being also shown in section. Fig. 2 is aperspective view of my wrench.

In constructing this device I employ two curved sections 1 which arehinged together as shown at 2, said sections forming jaws which whenclosed form a ring which. surrounds the casing. The inner faces of thesejaws are recessed and in the recesses are secured gripping plates 3provided with toothed or roughened faces to cause them to firmly gripthe sides of the casing. These plates 3 preferably project outwardlyfrom the inner faces of the jaws 1. To the free end of one jaw ispivotally secured a metal link 4 and the free end of the other jawcarries a laterally projecting saddle 5 formed integral with the jaw andforming a concave outer face.

In operation the jaws are placed about the casing 6 to be tightened, andthe usual pole or bar is passed through the link l and bears upon theconcave faceof the saddle 5, and with the bar as a lever the ring formedby the jaws 1 is rotated, rotating the casing gripped by it. It will beobvious that an appliance of this kind can be fitted upon the casing andremove d from it much more quickly than the casing could be wrapped withthe necessary amount of rope.

Having thus fullydescribed my invention, what I claim as new and desireto secure by Letters Patent is A device of the kind described comprisingtwo curved jaws hinged together, said jaws forming a circle when theirfree ends are brought together, a laterally extending saddle having aconcave base, and a link pivotally connected to the free end of theother jaw, said link receiving a pole, and said saddle forming a bearingfor the pole, the inner face of said jaws being provided with suitablegripping teeth.

J. G. LAFFE'RTY.

Witnesses:

H, M. TUsTlN, GEORGE ADAMS.

